Dynamic Frame of the Chair

ABSTRACT

There is noticed a dynamic frame of the chair, which comprises a seat holder ( 1 ), to which a swivel sleeve ( 3 ) is demountably attached from one side, into which a spherical head ( 41 ) of a spherical thread swivel ( 4 ) with a threaded end piece ( 42 ) is tightly seated, to which a nut ( 7 ) is demountably attached and to which a silent block bushing ( 2 ) is demountably attached from the other side, to which an annular locking ring ( 6 ) with four locking undercuts ( 61 ) and four locking noses ( 62 ) is demountably attached from one side and a frame sleeve ( 5 ) with a sliding hole ( 53 ) and four sleeve noses ( 51 ) and four sleeve reinforcement pieces ( 52 ) is detachably fastened from the other side.

TECHNICAL FIELD

The present technical solution relates to a seating area of chairs with a stabilizing seating mechanism, more particularly for office chairs, to provide the optimal posture of the spine when sitting.

STATE OF THE ART

So far, chairs are known as typically comprising a fixed seat, enabling only upward and downward adjustment. These solutions incorporate a seat tightly connected to a chair backrest and its adjustable mechanism. Their disadvantage is that such a design does not address the problem with unilateral stress exerted on the spine and pelvis area.

The known technical solution is described in the registered Slovak utility model No. 7 183 entitled “A Chair with Balancing Mechanism”, where the chair balancing mechanism comprises a flexible device installed between the seat and chair leg, where a progressive wound spring represents the flexible device, whereas a stabilizing mechanism is installed between the seat and chair leg from the outer side of the flexible device. The disadvantage of this technical solution is the impossibility to control the hardness of balancing depending on the weight of the person seated.

Another known technical solution is described in the registered Slovak utility model No. 5 675 entitled “A Chair with Seat Stabilizing Mechanism”. The chair comprises an adjustable segment, demountably attached to the base from one side and tightly fastened to the frame with a stable backrest from the other side, to which a jointing element is also tightly connected, from the other side pivotally seated in a sleeve, tightly connected to an unstable pad and/or unstable seat. The disadvantage of this technical solution is the impossibility to control the hardness of balancing depending on the weight of the person seated.

Another known technical solution is described in the registered Slovak utility model No. 5 251 entitled “A Chair with a Right and Left Flexible Seating Area” where the right flexible seating part and the left flexible seating part are coupled with jointed and spring mechanisms, which are further connected with the central leg of the chair. The disadvantage of this technical solution is undesirable stress exerted on the back and waist of the seated person while sitting for long periods.

BACKGROUND OF THE TECHNICAL SOLUTION

To a large extent, the above-mentioned disadvantages are overcome by a dynamic frame of the chair disclosed in this technical solution. Its principle is that it comprises a seat holder, to which a swivel sleeve is demountably attached from one side, into which a spherical head of a spherical thread swivel with a threaded end piece are tightly seated, to which a nut is demountably attached. From the other side, a silent block bushing is demountably attached to the seat holder; an annular locking ring with four locking undercuts and four locking noses is demountably attached to the silent block bushing from one side; a frame sleeve with a sliding hole and four sleeve noses and four sleeve reinforcement pieces is demountably attached from the other side.

Besides, a mounting of the annular locking ring on the seat holder is advantageous.

OVERVIEW OF PICTURES IN THE DRAWINGS

The attached drawings explain in more detail the summary of the technical solution; FIG. 1 shows a sectional view of the dynamic frame of the chair with the annular locking ring in the locked position,

FIG. 2 shows an axonometric projection onto the annular locking ring;

FIG. 3 shows an axonometric projection onto the inner part of the frame sleeve;

FIG. 4 shows a sectional view of the dynamic frame of the chair with the annular locking ring in the locked position.

1—seat holder

2—silent block

3—swivel sleeve

4—spherical thread swivel

41—spherical head

42—threaded end piece

5—frame sleeve

51—sleeve nose

52—sleeve reinforcement piece

53—sliding hole

6—annular locking ring

61—locking undercut

62—locking nose

7—nut

EXAMPLES OF REALISATION Example 1

The dynamic frame of the chair acc. to FIG. 1 comprises the seat holder 1. The brass swivel sleeve 3 is demountably attached to the seat holder 1 from one side. The spherical head 41 of the stainless steel spherical thread swivel 4 is tightly seated in the swivel sleeve 3. The threaded end piece 42 is seated on the lower part of the spherical thread swivel 4. The nut 7 is demountably attached to the threaded end piece 42. The plastic annular locking ring 6 is fastened to the seat holder 1 from the other side. The rubber silent block bushing 2, diameter 60 mm, is demountably attached to the seat holder 1. The annular locking ring 6 is demountably attached to the silent block bushing 2. Four locking undercuts 61, designed to lock fixed seating position, are created in the annular locking ring 6 according to FIG. 2. Besides, four locking tooth-shaped noses 62 are created in the annular locking ring 6, evenly distributed along the quarters of the locking ring 6. The aluminum alloy frame sleeve 5 is loosely seated on the silent block bushing 2 according to FIG. 1. One sliding hole 53, designed to slide the dynamic frame of the chair on the chair base, is created in the frame sleeve 5 according to FIG. 4. Four sleeve noses 51, designed for locking, are created on the inner side of the frame sleeve 5 according to FIG. 3. Four sleeve reinforcement pieces 52, designed to reinforce the dynamic frame, are further created on the inner side of the frame sleeve 5.

Example 2

The dynamic frame of the chair acc. to FIG. 4 comprises the seat holder 1. The brass swivel sleeve 3 is demountably attached to the seat holder 1 from one side. The spherical head 41 of the stainless steel spherical thread swivel 4 is tightly seated in the swivel sleeve 3. The threaded end piece 42 is seated on the lower part of the spherical thread swivel 4. The nut 7 is demountably attached to the threaded end piece 42. The rubber silent block bushing 2, diameter 90 mm, is demountably attached to the seat holder 1 from the other side. The plastic annular locking ring 6 is demountably attached to the silent block bushing 2. Four locking undercuts 61, designed to lock fixed seating position, are created in the annular locking ring 6 according to FIG. 2. Besides, four locking tooth-shaped noses 62 are created in the annular locking ring 6, evenly distributed along the quarters of the locking ring 6. The aluminum alloy frame sleeve 5 is demountably attached to the annular locking ring 6. One sliding hole 53, designed to slide the dynamic frame of the chair on the chair base, is created in the frame sleeve 5. Four sleeve noses 51, designed for locking, are created on the inner side of the frame sleeve 5 according to FIG. 3. Besides, four sleeve reinforcement pieces 52, designed to reinforce the dynamic frame, are further created on the inner side of the frame sleeve 5.

INDUSTRIAL APPLICABILITY

The technical solution may be used to provide a dynamic sitting posture on the chair to people suffering from problems and pain in the spine and lower back as the design facilitates an active and healthy sitting position, the result of which is a good body posture, strengthening spinal and abdomen muscles. Simultaneously, it does not allow for the rest of spinal muscles and by perfect copying of movements of the body of the seated user significantly reduces the pressure exerted on intervertebral discs as the spine holds the ideal position and back muscles work properly. The technical solution also provides unique pelvis mobility and even long-lasting sitting is not manifested by pain in the lower back. 

1. A dynamic frame of the chair, characterized in that it comprises a seat holder (1), to which a swivel sleeve (3) is demountably attached from one side, into which a spherical head (41) of a spherical thread swivel (4) with a threaded end piece (42) is tightly seated, to which a nut (7) is demountably attached and to which a silent block bushing (2) is demountably attached from the other side, to which an annular locking ring (6) with four locking undercuts (61) and four locking noses (62) is demountably attached from one side and a frame sleeve (5) with a sliding hole (53) and four sleeve noses (51) and four sleeve reinforcement pieces (52) is detachably fastened from the other side.
 2. A dynamic frame of the chair according to the claim 1 characterized in that the annular locking ring (6) is seated on the seat holder (1). 